idles rough no power

[go8]

I have a 2002 Grand Am. We had it put on the computer and it had 3 codes they are: P0621, P1171, and P0300. The mechanic said the coil pack was bad so we replaced it and it is still running really rough and you can smell gas when you start it. If anyone can help please respond. I thought it might be the oxygen sensor but he said the codes doesn't show it being that.

[4kQuad]

Got to go with spark plugs or wires...

See how they look. If you can run the car in the dark with the hood up. Look for sparks, that might point to bad wires.

[go8]

Replaced the coil pack and the car is still running off 2 cylinders and runs rich. Was wondering if anyone knows if it could be the ignition module or have any other ideas.

[4kQuad]

Why don't you want to check the plugs. If there fouled or bad, they will miss, just like as if a coil was bad.

Pull them and look, thats free.